I've had an issue where when used ipv6 address the uri stays undefined, works fine for ipv4.
getzola/zola#2854

So need to modify few lines in livereload-js

Thank you!
This doesn't seem like the right place to access the window global. It makes the test fail too.
Also, aren't you able to pass the host value in the format you want through options.host?

When I'm using ipv6:

this.options:

{
    "https": false,
    "port": 1024,
    "snipver": null,
    "ext": null,
    "extver": null,
    "mindelay": 10,
    "maxdelay": 60000,
    "handshake_timeout": 5000
}

this.options.host is undefined. `window.location.hostname worked fine and browser could connect to ws successfully

And it does work when you specify a host value in one of the options?

Yes it works when specified

But the current host should be detected, right?
FWIW: there is a test with ipv6 which shows how it should work.
Please feel free to resubmit a PR with a failing test case to show what doesn't work.